He didn't make __ clear when and where the meeting world would be held.

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• He didn't make __ clear when and where the meeting world would be held.
• he didn't make ____clear when and where the meeting would be held.
• He didn't make __ clear when and where the meeting world would be held.Ait Bthis Cthat Dthese
• 做代词时候that与it区别例如he did not make ( )clear when and where the meeting would be held.答案括号里的填it但是填that不行吗我知道了，that没有代替重句的功能只能代替单数名词或不可数名词那么如果例题是the English spoken in USA is only a slightly different from ( )spoken in England.答案是用that那为什么不能用it
• he didn't make ____clear when and where the meeting would be held.
• 几道英文题有关于it和that的用法1.—He got his first book published.It turned out to be a bestseller.—When was ______?—______ was in 2000 when he was still in college.(浙江2007)A.that; This B.this; It C.it; This D.that; It 我想知道第一个空为什么填that,it 为什么不可以?2.He didn't make __ clear when and where the meeting world would be held.A.it B.this C.that D.these想知道为什么不能选C.3.it 和that在代替文中所提及的事物时,有什么区别?
• 若(2a-1)x的3次方y的b+1次方是关于x、y的六次单项式,且系数为3,求代数式
• 如图所示的电路，R1=30Ω，R2=10Ω，开关S闭合后，电流表A的示数为0.4A，求电源电压、通过R2的电流和干路中的电流．